Anchoring device for teeth-fillings.



A. P. ANDERBERG. ANGHORING DEVICE FOR TEETH FILLINGS.

APPLICATION FILED JUNE 10, 1911.

- Patented Feb. 27, 1912.

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AXEL F. ANDERBERG', OF PAW'IUCKET, RHODE ISLAND.

ANCHORING DEVICE FOR TEETH-FILLINGS.

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Specification of Letters Patent.

Application filed June 10, 1911. Serial No. 632,421.

' ments in Anchoring Devices for Teeth- Fillings, of which the following is a specification.

This invention relates to dentistry, and

more particularly to means for securing a filling in a cavity of the tooth and has for its object to provide a filling anchoring device in a manner as hereinafter set forth for securely maintaining the filling in position which is simple in its construction and arrangement, strong, durable, efficient in its: use, conveniently applied-and inexpensive to manufacture.

With the foregoing and other objects in view, the invention consists of the novel construction, combination and arrangement of parts as hereinafter more specifically described and illustrated in the accompanying drawings, wherein is shown an embodiment of the invention, but it is to be understood that changes, variations and modifications can be resorted to which come within the scope of the claims hereunto appended.

In describing the invention in detail reference is had to the accompanying drawings wherein like reference characters denote corresponding parts throughout the several views and in which Figure 1 is an elevation of an anchoring device in accordance with this invention. Fig. 2 is a sectional view of a tooth bored and trimmed for the reception of the filling and anchoring device. Fig. 3 is a view similar to Fig. 2 and further showing positioned in the tooth the inner member of the anchoring device. Fig. 3, Fig. 5 is a sectional view of the trimmed and bored tooth showing the anchoring device positioned therein and with the cavity of the tooth provided with a wax filling to form the impression for the gold filling, Fig. 6 is a sectional view of a tooth having a gold filling secured in position by an anchoring device in accordance with this invention, Fig. 7 is a top plan view of Fig. 6 illustrating the means to prevent the unscrewing of the outer member of the anchoring device, and Fig. 8 illustrates the manner of anchoring gold fillings in accordance with this invention which may be used to ad- Fig. 4 is a top plan of vantage to hold bridge work firmly between them.

An anchoring device for a tooth filling in accordance with this invention includes an inner tubular member a bored from end to end and with the wall of the bore provided with screw threads as at a. periphery of the member a* is indented or knurled. The inner member (ll is positioned in a tubular opening 0 which is bored in the tooth -a and terminates at its upperend in a squared recess c which is arranged in the base of cavity 0 to receive a gold filling -(Z. The inner member ais secured in position by suitable cement and is prevented from turning in the opening c by the gold filling -cZ which is positioned in the recess --0- and is secured to the member -a by a flux or any other suitable manner. As the filling dis square and is secured to the member -'-ait is obvious that the lat-- ter cannot turn in the opening -0- as the filling cZ will prevent the same.

The anchoring device further includes an outer member referred to generally by the reference character b+ and which consists of a tapering shank b and a threaded extension b which is adapted to engage with the threads a' of the member a'e whereby the two members will be coupled together. The outer end of the shank bis formed with a transversely extending slit -b for the reception of a suitable tool for connecting and disconnecting the member -b to and from the member a.

In connection with the use of the anchoring device it will be stated that the inner member -ais first positioned in the opening cas shown in Fig. 3, after which the outer member is connected to the member a but the shank of said outer member is provided with any suitable coating such as Vaseline so as to prevent the adhering thereto of wax -e-- which is placed in the cavity 0 to form the impression for a second gold filling 06*. When the im pression has been formed the outer member ?9 is then disconnected from the member aand the body of the Wax then used to make the matrix forthe gold filling a and after the latter is molded a central tapering opening is formed to receive the shank b of the outer member .72. The filling a is then mounted in the cavity c the outer member bconnected to the inner member Patented Feb. 27, 1912.

The

a,- and that portion of the outer member b which projects from the filling removed so that the outer end of the member -b will be flushed with the top of the filling a see Fig. 6. Pins -f, fare then driven in the filling and into the shank b, see Fig. 7, to prevent rotative movement of the member --b with respect to the member as-. a

In Fig. 8 of the drawings is illustrated the gold fillings -a*- as holding firmly therebetween the bridge work g, by means of solder, as at points 8, 8.

By use of my improved anchoring device, as described, I am enabled to firmly secure any inlay, bridge, crown, plate, or other appliances used in dentistry.

What I claim is 1. An anchoring device for a tooth filling including an inner tubular member adapted to be secured in the body of the tooth below the cavity and provided with interior threads, and an outer member including a tapering shank and a threaded extension,

said extension engaging with the threads of said inner member and said tapering shank extending through and engaging with the filling for maintaining the latter in the cavity of the tooth.

2. An anchoring device for a tooth filling including an inner tubular member adapted to be secured in the body of the tooth below the cavity and provided with interior threads, an outer member including a tapering shank and a threaded extension, said extension engaging with the threads of said inner member and said tapering shank extending through and engaging with the filling for maintaining the latter in the cavity of the tooth, and means mounted in a recess at the bottom of the tooth cavity to prevent rotative movement of said inner member.

In testimony whereof I afiix my signature in presence of two witnesses.

AXEL F. ANDERBERG.

Witnesses:

PETER O. CANNON, J OHN WILSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

